Control circuit for adjusting height of presser foot of flat seaming machine

Abstract

The utility model discloses a control circuit for adjusting the height of a presser foot of a flat seaming machine, which relates to the technical field of sewing machines and is characterized in that a key module feeds back a key trigger signal to a display screen control chip when an entity key switch on a control panel is triggered; the display screen control chip sends a corresponding stepping adjustment signal to the stepping control chip according to the key trigger signal, and the adjusted presser foot height is displayed through the display screen; and the stepping control chip outputs a corresponding driving signal according to the stepping adjusting signal to drive the stepping motor to adjust the height of the sewing machine presser foot. The height of the presser foot of the flat seaming machine can be adjusted more conveniently, the operation difficulty of a user is reduced, and the overall efficiency of the operation process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a control circuit for adjusting the height of a presser foot of a stretch sewing machine. Background Art

[0002] A flat sewing machine is a special sewing equipment, which is mainly used to process the edges of clothes or other textiles to make them neater and more durable. Its working principle is to form dense stitches on the edge of the fabric through multiple needles and threads working at the same time, so as to achieve the purpose of reinforcing the edge and preventing unthreading. Most modern flat sewing machines are equipped with color touch screens or high-resolution LCD screens. Users can directly select sewing modes, set parameters, etc. on the screen without manually adjusting knobs or buttons. Users can choose from a variety of sewing modes provided on the screen, including but not limited to straight stitching, zigzag stitching, decorative stitching, embroidery, etc. At the same time, users can also adjust key parameters such as sewing speed, stitch length, presser foot height, etc. directly on the screen to adapt to different materials and sewing needs.

[0003] However, this type of parameter adjustment interface is often hidden deep in the control interface. For beginners or users who are not familiar with digital interfaces, it may take some time to adapt to adjusting the presser foot height through the screen. At the same time, touch screens or button interfaces may be more prone to misoperation, especially during fast operations or multitasking. Utility Model Content

[0004] In order to simplify the adjustment of the presser foot height and improve the efficiency of the presser foot adjustment, the utility model proposes a control circuit for adjusting the presser foot height of a flat sewing machine, and a physical adjustment button for adjusting the presser foot height is provided on the control panel. The control circuit includes:

[0005] The button module is used to feed back the button trigger signal to the control panel chip when the physical adjustment button on the control panel is triggered;

[0006] The control panel chip is used to send the corresponding step adjustment signal to the main control chip according to the button trigger signal, and display the adjusted presser foot height through the display screen;

[0007] The main control chip is used to output a corresponding driving signal according to the step adjustment signal to drive the stepping motor to adjust the height of the presser foot of the interlock sewing machine.

[0008] Furthermore, the button module includes a first button unit and a second button unit, wherein the first button unit is used to control the presser foot height gear to be adjusted upward, and the second button unit is used to control the presser foot height gear to be adjusted downward.

[0009] Furthermore, the presser foot height gear is provided with several adjustable gears according to user needs.

[0010] The circuit composition of the first key unit includes:

[0011] A first touch switch, wherein one end of the first touch switch is grounded, the other end is connected to the working voltage through a first resistor, and an upward key trigger signal is fed back to the control panel chip through a second resistor;

[0012] The circuit composition of the second key unit includes:

[0013] A second touch switch, wherein one end of the second touch switch is grounded, the other end is connected to the working voltage through the third resistor, and the key trigger signal is fed back to the control panel chip through the fourth resistor.

[0014] Furthermore, the control panel chip adopts a chip model MM32SPIN27PS, which contains pins 1 to 64, wherein pin 62 is used to receive the upward key trigger signal fed back by the first key unit, pin 63 is used to receive the downward key trigger signal fed back by the second key unit, and pin 56 is used to output the step adjustment signal.

[0015] Furthermore, the main control chip adopts a chip model HC32F460KCTA, which includes the first pin to the sixty-fourth pin, wherein the twenty-fourth pin is used to receive the step adjustment signal, and the thirty-eighth pin is used to output a PWM signal to drive the stepper motor.

[0016] Compared with the prior art, the utility model has at least the following beneficial effects:

[0017] (1) The control circuit for adjusting the height of the presser foot of a stretch sewing machine described in the utility model can more conveniently adjust the height of the presser foot of the stretch sewing machine, thereby reducing the operating difficulty of the user and improving the overall efficiency of the operating process;

[0018] (2) The presser foot height can be adjusted by physical buttons, which is not affected by the use environment and has better control stability. At the same time, since the adjustment is based on the circuit, the maintenance cost is also lower;

[0019] (3) In actual use, it is more suitable for quick operation while wearing safety gloves, without the risk of accidental touch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A modular schematic diagram of a control circuit for adjusting the presser foot height of a flat sewing machine;

[0021] Figure 2 A schematic diagram of a control panel interface for a control circuit for adjusting the presser foot height of a flat sewing machine;

[0022] Figure 3 It is the schematic diagram of the key unit circuit;

[0023] Figure 4 This is a schematic diagram of the control panel chip pins;

[0024] Figure 5 This is a schematic diagram of the main control chip pins;

[0025] Figure 6 The present invention is a schematic diagram of an overall circuit of a control circuit for adjusting the presser foot height of a flat sewing machine. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] With the advancement of technology, modern interlock sewing machines have not only significantly improved their performance, but also added many intelligent functions. In order to ensure the stability of interlock sewing machines during the adjustment of the presser foot height, the adjustment process is simplified, such as Figure 1 As shown, the utility model proposes a control circuit for adjusting the presser foot height of a flat sewing machine, and a physical adjustment button for adjusting the presser foot height is provided on the control panel. The control circuit includes:

[0028] The button module is used to feed back the button trigger signal to the control panel chip when the physical adjustment button on the control panel is triggered;

[0029] The control panel chip is used to send the corresponding step adjustment signal to the main control chip according to the button trigger signal, and display the adjusted presser foot height through the display screen;

[0030] The main control chip is used to output a corresponding driving signal according to the step adjustment signal to drive the stepping motor to adjust the height of the presser foot of the interlock sewing machine.

[0031] According to actual user needs, the presser foot height includes several height levels to meet the user's needs when sewing the edges of textiles of different thicknesses.

[0032] Among them, Figure 2 As shown in the schematic diagram of the control panel interface, in order to achieve bidirectional stable adjustment of the presser foot height, the button module proposed by the utility model includes a first button unit (triggered by the presser foot raising button on the control panel) and a second button unit (triggered by the presser foot lowering button on the control panel), wherein the first button unit is used to control the presser foot height gear to be adjusted upward, and the second button unit is used to control the presser foot height gear to be adjusted downward. The specific circuit structure of each button unit is as follows Figure 3 As shown, where:

[0033] The first button unit includes a first touch switch K1, one end (1, 3 interface) of the first touch switch K1 is grounded, the other end (2, 4 interface) is connected to the working voltage through the first resistor R1, and the button trigger signal is fed back (REST port) to the control panel chip through the second resistor R2;

[0034] The second button unit includes a second touch switch K2, one end (1, 3 interface) of the second touch switch K2 is grounded, the other end (2, 4 interface) is connected to the working voltage through the third resistor R3, and the button trigger signal is down-regulated to the control panel chip through the fourth resistor R4 feedback (REST port).

[0035] Taking the first button unit as an example, the principle of adjusting the presser foot height is that the presser foot raising button on the control panel is in contact with the first touch switch K1. Before the presser foot raising button is not touched, the first touch switch K1 is in a non-conducting state, so the 3.3V working voltage directly outputs a high voltage to the control panel chip from the REST port through the first resistor R1 and the second resistor R2, and the REST port is at a high potential at this time. When the presser foot raising button is touched, the first touch switch K1 enters the conducting state, at which time the first touch switch K1 is turned on and grounded, and the 3.3V working voltage connected to the first resistor R1 is directly grounded through the first touch switch K1, and the REST port is at a low potential at this time due to the grounding of the working voltage. In this way, a high-low potential signal conversion will be triggered before and after the presser foot raising button is touched, and it is precisely with the help of the potential change before and after the first touch switch K1 is touched, so as to help the control panel chip read the demand information for the presser foot height increase. Similarly, the second button unit also reads the demand information for the presser foot height reduction through this principle.

[0036] Here, the control panel chip model selected by the utility model is MM32SPIN27PS (such as Figure 4 , Figure 6As shown in the figure, the control panel chip can receive the trigger signals of each function button on the control panel (such as thread dialing, needle stop position, thread trimming, presser foot lifting, stepping function, presser foot lifting after thread trimming, and system interface, etc.) and feedback the corresponding function signal to the main control chip, and display the relevant information by connecting to the display screen on the control panel, so as to help users understand the current presser foot height gear and other information. The control panel chip contains the first pin to the sixty-fourth pin, and the height gear up-adjustment signal and the height gear down-adjustment signal are received respectively through the two key trigger signal receiving pins. Specifically, the sixty-second pin on the control panel chip is used to receive the up-adjustment key trigger signal fed back by the first key unit, and the sixty-third pin is used to receive the down-adjustment key trigger signal fed back by the second key unit. After receiving the key trigger signal, the control panel chip will also convert the key trigger signal, which is an electrical signal, into a step adjustment signal under the corresponding gear digital signal, and output it to the main control chip through the fifty-sixth pin.

[0037] The main control chip is HC32F460KCTA (such as Figure 5 , Figure 6 The main control chip is integrated with multiple adjustment drive functions, and can perform corresponding drive adjustments (such as thread dialing, needle stop position, thread trimming, presser foot lifting, stepping function, presser foot lifting after thread trimming, etc.) according to the function signal sent by the control panel chip. The main control chip contains the first pin to the sixty-fourth pin, and the presser foot height adjustment is related to the step adjustment signal received through its twenty-fourth pin, and the PWM signal with the corresponding duty cycle is output through its thirty-eighth pin to realize the drive of the stepper motor. In this way, the stepper motor can adjust the presser foot height to different gears according to the duty cycle change of the PWM signal.

[0038] Next, this embodiment is explained by an example. In this example, there are 8 presser foot height gears, and the relationship between gear-presser foot height-stepping motor rotation angle is shown in Table 1:

[0039] Table 1:

[0040]

[0041] When the interlock sewing machine is in standby mode, the presser foot is in the standby position (0mm) in a stationary state. After the user steps on the working pedal of the interlock sewing machine to enter the working state, the system is powered on, and the stepper motor rotates from the initial position of 0° to 510°, controlling the presser foot to be raised to the 5mm state corresponding to the default position. If the user has a higher pressure foot height requirement (such as the target material thickness is greater than 5mm, a higher presser foot height is required), the user can adjust the presser foot height position by pressing the presser foot raising button on the control panel before controlling the interlock sewing machine from the stationary state to the working state, and switch the position from the default position to the target position. In this case, when the presser foot raising button is pressed once, the 62nd pin on the control panel chip senses a high-low potential signal change. At this time, the control panel chip reads a height increase requirement information (that is, the height is adjusted to gear 1), and after the presser foot height gear information is switched from 5mm corresponding to the default gear to 5.5mm corresponding to gear 1 on the display screen, the step adjustment signal (digital signal) corresponding to gear 1 is output to the main control chip. The main control chip reads the step adjustment signal and outputs a PWM signal with a corresponding duty cycle to the stepper motor, controlling the stepper motor to rotate to 540°, thereby driving the presser foot to be raised to a height of 5.5mm. If gear 1 is still not the target gear (for example, the target gear is gear 7), the user can press the presser foot raising button on the control panel 6 times in succession to trigger 6 high-low potential signal changes at the 62nd pin of the control panel chip, thereby helping the control panel chip read the 7th gear height adjustment requirement information, and finally control the stepper motor to rotate to 700° to raise the presser foot height to 8.5mm.

[0042] If the presser foot height of the interlock sewing machine needs to be lowered, or the presser foot height gear is set too high during the setting process, the user can also press the presser foot lowering button on the control panel to trigger one or more high-low potential changes at the 63rd pin of the control panel chip to read the downshift information of the presser foot height gear, and send the step adjustment signal of the corresponding gear to the main control chip to drive and adjust the stepper motor. In this way, there is no need to enter the system interface to adjust the presser foot height gear, and the presser foot height gear can be quickly adjusted directly through the physical buttons on the control panel, which greatly improves the overall working efficiency of the interlock sewing machine.

[0043] In summary, the control circuit for adjusting the height of the presser foot of a stretch sewing machine described in the utility model can more conveniently adjust the height of the presser foot of the stretch sewing machine, reduce the operating difficulty of the user, and improve the overall efficiency of the operating process.

[0044] The presser foot height can be adjusted through physical buttons, which is not affected by the use environment and has better control stability. At the same time, since the adjustment is based on the circuit, the maintenance cost is also lower. In actual use, it can be used for quick operation while wearing safety gloves to avoid the risk of accidental touch.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A control circuit for adjusting the presser foot height of a flat sewing machine, characterized in that: There is a physical adjustment button for adjusting the presser foot height on the control panel, and the control circuit includes: The button module is used to feed back the button trigger signal to the control panel chip when the physical adjustment button on the control panel is triggered; The control panel chip is used to send the corresponding step adjustment signal to the main control chip according to the button trigger signal, and display the adjusted presser foot height through the display screen; The main control chip is used to output a corresponding driving signal according to the step adjustment signal to drive the stepping motor to adjust the height of the presser foot of the interlock sewing machine.

2. A control circuit for adjusting the presser foot height of a flat sewing machine as claimed in claim 1, characterized in that: The key module includes a first key unit and a second key unit, wherein the first key unit is used to control the presser foot height gear to be adjusted upward, and the second key unit is used to control the presser foot height gear to be adjusted downward.

3. A control circuit for adjusting the presser foot height of a flat sewing machine as claimed in claim 2, characterized in that: The presser foot height gear is provided with several adjustable gears according to user requirements.

4. A control circuit for adjusting the presser foot height of a flat sewing machine as claimed in claim 2, characterized in that: The circuit composition of the first key unit includes: A first touch switch, wherein one end of the first touch switch is grounded, the other end is connected to the working voltage through a first resistor, and an upward key trigger signal is fed back to the control panel chip through a second resistor; The circuit composition of the second key unit includes: A second touch switch, wherein one end of the second touch switch is grounded, the other end is connected to the working voltage through the third resistor, and the key trigger signal is fed back to the control panel chip through the fourth resistor.

5. A control circuit for adjusting the presser foot height of a flat sewing machine as claimed in claim 2, characterized in that: The control panel chip uses a chip model MM32SPIN27PS, which contains pins 1 to 64, wherein pin 62 is used to receive the upward key trigger signal fed back by the first key unit, pin 63 is used to receive the downward key trigger signal fed back by the second key unit, and pin 56 is used to output the step adjustment signal.

6. A control circuit for adjusting the presser foot height of a flat sewing machine as claimed in claim 1, characterized in that: The main control chip is a chip of model HC32F460KCTA, which has pins 1 to 64, wherein pin 24 is used to receive a step adjustment signal, and pin 38 is used to output a PWM signal to drive a stepper motor.

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